| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving circuit suppressing the occurrence of arc or contact roughness due to repetition of ON/OFF in a point of contact provided in the driving circuit of a brake coil using a high DC voltage. <P>SOLUTION: With respect to ON/OFF control timing between the point of contact 21 for conducting ON/OFF by inputting a signal from a control section 22 in a control panel in order to turn ON/OFF electricity to the brake coil 12, and a semiconductor switch 3 provided between a converter 2 and the point of contact 21 and conducting ON/OFF of a direct current power source on a positive electrode side by inputting a signal of a semiconductor switch driving circuit 30, when the timing is ON, the point of contact 21 is turned on, and then, the semiconductor switch 3 is turned on, and when OFF, the semiconductor switch 3 is turned off, and then, the point of contact 21 is turned off. Thus, the point of contact 21 can be turned ON/OFF in high voltage unapplied state. <P>COPYRIGHT: (C)2009,JPO&INPIT |
